Osgyth is an Anglo-Saxon feminine name composed of os (god) and gyth (battle), cognate with Norse Ásgunnr.
Osgyth [Joseph Stevenson 1841 Liber Vitæ Ecclesiæ Dunelmensis, page 3].
Osgiđ [Joseph Stevenson 1841 Liber Vitæ Ecclesiæ Dunelmensis, page 4].
Osgið [Henry Sweet 1886 The Oldest English Texts, page 155].
Osgid [Henry Sweet 1886 The Oldest English Texts, page 155].
Ōsgȳþ [Henry Sweet 1886 The Oldest English Texts, page 639].
Osyth [William Searle 1899 Anglo-Saxon Bishops, Kings and Nobles, page 291].
Osgydh [Ernst Förstemann 1900 Altdeutsches Namenbuch, volume 1, 2nd edition, column 127].
Osgyþ [Elisabeth Okasha 2011 Women’s Names in Old English, page 59].
Osgyð [Keith Briggs 2021 An index to personal names in English place-names, 1st edition, page 213].
os = god [Jay Treat 1983 Dragon 7 (10): 57].
gyth = battle, strife [Elizabeth Withycombe 1945 The Oxford Dictionary of English Christian Names, 1st edition, page 5].
The name Osgyth appears in a list of queens and abbesses [Joseph Stevenson 1841 Liber Vitæ Ecclesiæ Dunelmensis, page 3].